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BQ2057充电电路的充电电流的无法改变



我想问一下,我在BQ2057的设计中把三极管(FZT788B)的型号换成了NJD1718,出现的问题是:调节电阻:Rsns无法改变充电电流的大小,最大值在260MA左右,关于这个三极管的功率、热阻、HFE的参数已经使用正确。出现这样的问题怎么办?输入电压为:15V